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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
        var userCurAge = prompt("你现在多少岁了？");
        var nserNxetAge = parseInt(userCurAge) + parseInt(5);
        console.log("据我估计，五年后，你可能" + nserNxetAge + "岁了");
    </script>
</head>
<body>
    
</body>
</html>